I just know what others know, that they deny having any major exposure to FTX and others but there are a few problems with the narrative:
After their complete denial of having funds involved with FTX, seems like they had 200 million there:
https://twitter.com/ASvanevik/status/1589972490549612544
which "miraculously" they've withdrawn two days before the bankruptcy filing.
So do we trust what they are saying that all of their assets are fully collateralized and they have no exposure and no shady deals? They might be telling the truth, they might have a really good risk management team and a lot of information on everything that moves in the crypto world, or they could be just the next one to crash.
Also, even if everything is fine with nexo internally, even in their tweets they did say this:
https://twitter.com/Nexo/status/1597268229084225537
So at any point, they can end up with frozen or lost coins because of a third party, the risk is there and they know it!